meanwhile, president obama has left no question that the boston marathon bombing was an act of terrorism. the fbi is it evidence response team processing a scene along with the alcohol, tobacco, firearms, and state and local agencies looking for evidence and coming through thdebris for any clues that might lead to the capture of those responsible for the carnage. >> this morning the fbi along with boston pd, massachusetts state police, and atf, officially began its forensic evans recovery effort at the site. their goal was to recover physical items related to the blast. those items have been recovered and are being sent to the fbi's laboratory in quantico, virginia lou: the fbi has confirmed there are no plans a responsibility and that the range of suspects and motives remains wide open. authorities are asking anyone with phographs orideo near the scene of the explosions to take that evidence to the fbi for examination. the critically important part in the investigation focuses on the components used to make the two bombs and the device or devices used to detonate them. similar devices a